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What is your question?
diagnostic test code: PO431 warm up catalyst efficiency below threshold Bank 2
had the same problem with my 02 xg 350 76k I used b12 fuel treatment it solved the problem $3-5 in wallmart autozone advanced etc http://www.google.com/imgres?um=1&hl=en&sa=N&biw=1429&bih=622&tbm=isch&tbnid=XRBtzqqrNdOupM:&imgrefurl=http://berrymanproducts.com/Default.aspx%3Ftabid%3D140&docid=iNAyVqx73CDL3M&imgurl=http://berrymanproducts.com/Portals/0/uploads/0116.jpg&w=457&h=1391&ei=gpUTT8HxEefa0QHQ-biYAw&zoom=1